Radioactivity
µCitoCi
Convert microcuries (µCi) to curies (Ci).
Factor1 µCi = 1e-6 Ci
Converter
µCi
Accepts numbers or expressions, e.g. 150 + 14.7
Result
Ci
Rendered to 6 significant figures.
Formula
Formula
Ci = µCi × 1e-6
Multiply any value in microcuries by 1e-6 to obtain the value in curies.
Worked example
Convert 1.00000e+6 µCi to Ci.
- 01Start with 1.00000e+6 µCi.
- 02Multiply by the conversion factor: 1.00000e+6 × 1e-6 = 1 Ci.
Result1.00000e+6 µCi = 1 Ci
Conversion table
| µCi | Ci |
|---|---|
| 1 | 1e-6 |
| 2 | 2e-6 |
| 5 | 5e-6 |
| 10 | 1e-5 |
| 20 | 2e-5 |
| 50 | 5e-5 |
| 100 | 0.0001 |
| 200 | 0.0002 |
| 500 | 0.0005 |
| 1000 | 0.001 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from µCi to Ci?
1 µCi equals 1e-6 Ci. To convert, multiply the value in microcuries by 1e-6.
How do I convert 1 µCi to Ci?
1 µCi = 1e-6 Ci. For any value, multiply by 1e-6.
How do I convert Ci back to µCi?
Divide by the same factor — or equivalently, multiply by 1000000. So 1 Ci = 1.00000e+6 µCi.
When would I need to convert microcurie to curie?
Radioactivity (activity) conversions between µCi and Ci are routine in health physics, nuclear medicine ordering, environmental monitoring, radiopharmacy and reactor/accelerator-source documentation. The becquerel (Bq) is the SI unit; the curie (Ci) is the legacy unit (1 Ci ≡ 3.7×10¹⁰ Bq exactly). This category is strictly activity (decays per second) — it does NOT cover absorbed dose (Gy, rad), dose equivalent (Sv, rem), exposure or dose rate, all of which are different physical quantities and live in separate categories.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).